CN206759318U - A kind of frequency converter movement of modular unit - Google Patents

Abstract

The utility model discloses a frequency converter core of a modular unit, which comprises a cabinet, a fan assembly, an inverter unit and a rectification unit. The transformation unit and the rectification unit are electrically connected to form an electrical circuit. The utility model adopts a combination mode of a separate inverter unit and a separate rectification unit, which facilitates the assembly and maintenance of the frequency converter, and greatly reduces the labor intensity and difficulty of on-site operators. At the same time, the vertical arrangement of the fan and each component unit from top to bottom is adopted to control the temperature rise inside the cabinet, avoid overheating of each unit, and better protect the components inside the cabinet, thereby effectively extending the The service life of the inverter core.

Description

A frequency converter core of a modular unit

technical field

The utility model relates to the technical field of frequency converters, in particular to a frequency converter core of a modular unit.

Background technique

The inverter is a power control device that uses frequency conversion technology and microelectronics technology to control the speed of the motor by changing the frequency of the input motor power supply. With the rapid development of power electronics technology, inverters have been widely promoted and applied in many fields of the national economy, such as thermal power generation, petroleum, chemical industry, mining, metallurgy, water supply and other industries, and are playing an increasingly important role. effect.

The structure of the frequency converter is relatively complicated, among which the rectification unit, filter unit and inverter unit are its core parts. The rectifying unit is a device that converts alternating current into direct current, usually composed of rectifying diodes; the filtering unit effectively filters out the frequency point of a specific frequency in the power line or frequencies other than this frequency point to obtain a power signal of a specific frequency, or A device that eliminates a power signal of a specific frequency is usually composed of a capacitor; an inverter unit is a device that converts direct current into alternating current, and is usually composed of an IGBT insulated gate bipolar transistor.

As shown in Figure 12, the traditional frequency converter integrates the rectification unit 4, the inverter unit 3 and the filter unit 39 to form an integrated core, and then the integrated core is placed in the cabinet as a whole, but this type The assembly method has the following problems: first, the integrated core is heavy, which is not conducive to handling and assembly; secondly, the heat dissipation of the power unit in the integrated core is not ideal, and the heat dissipation method used in the integrated core of the general frequency converter The air enters from the bottom of the movement and the air exits from the top, and the power units are arranged on the radiator from bottom to top, which results in the higher the temperature of the wind and the temperature of the power unit as it reaches the top of the movement. High, it will affect the normal use and life of the power unit.

Therefore, it is necessary to improve the frequency converter core to solve the above-mentioned problems.

Utility model content

The purpose of the utility model is to provide a frequency converter core of a modular unit, which is used to solve the problem that the integrated core of the existing frequency converter is not only unfavorable for handling and assembly, but also unfavorable for heat dissipation of its internal power unit.

In order to achieve the above purpose, the utility model provides the following technical solutions: a frequency converter core of a modular unit, including a cabinet, a fan assembly, an inverter unit and a rectification unit, and the fan assembly, the inverter unit and the rectification unit are located in the The inside of the cabinet is arranged sequentially from top to bottom, and the inverter unit and the rectification unit are electrically connected to form an electrical circuit.

Preferably, the inverter unit includes an inverter box, an inverter radiator, an IGBT module, an inverter capacitor array, and an inverter voltage equalizing resistor array, and the inverter radiator and the inverter capacitor array are fixedly arranged on On both sides of the bottom of the inverter box, the IGBT module is fixed on the upper surface of the inverter radiator, the inverter voltage equalizing resistor array is fixed on the upper part of the inverter capacitor array, and the The IGBT module and the inverter capacitor array are electrically connected through the inverter copper bar,

The front and rear sides of the inverter box are provided with ventilation holes for the inverter box.

Preferably, the rectification unit includes a rectification box, a rectification radiator, a rectification diode module, a rectification capacitor array, a rectification equalizing resistor array, and the rectification radiator and the rectification capacitor array are fixedly arranged in the rectification box. On both sides of the bottom, the rectifying diode module is fixedly arranged on the upper surface of the rectifying radiator, the rectifying voltage equalizing resistor array is fixedly arranged on the upper part of the rectifying capacitor array, the rectifying capacitor array and the rectifying diode module The electrical connection is realized through the rectifying copper bar,

Both front and rear sides of the rectification box are provided with rectification box ventilation holes.

Preferably, the cabinet is a bottom opening type, the cabinet includes a panel and a cabinet frame, the panel includes a front panel, a rear panel, a left panel, a right panel, a top panel and a cabinet frame, the front panel, the rear panel, The left panel, right panel and top panel are set around the sides of the cabinet frame, the front panel is openable and the bottom of the front panel is provided with an air inlet window, and the top of the rear panel is provided with an air outlet window. hole.

Preferably, a mounting plate is provided inside the cabinet for supporting the fan assembly, and an air vent is opened on the mounting plate,

An air duct is also provided inside the cabinet, the air duct is arranged behind the inverter unit and the rectification unit, the top of the air duct is connected to the mounting plate, and the air duct is connected to the air vent corresponding settings.

Preferably, a support assembly is provided inside the cabinet, and the support assembly includes a first support beam, a second support beam, a third support beam and a fourth support beam, and a plurality of the first support beams are arranged on the installation The bottom of the board is fixedly connected with the cabinet frame for supporting the installation board. A plurality of second support beams are arranged on the left and right sides of the cabinet frame and fixedly connected with the cabinet frame. The third support beams are connected to the left and right corresponding second support beams, and the fourth support beams are connected to the front and rear corresponding third support beams, and the inverter unit and the rectification unit are connected to the The third support beam and the fourth support beam are fixedly connected.

Preferably, it is characterized in that a plurality of lifting bolts are arranged on the top of the cabinet.

Compared with the prior art, the frequency converter core of the modular unit described in the utility model has the following advantages: the utility model changes the traditional integrated core mode of the frequency converter, and adopts a separate inverter unit and a separate rectifier The way of unit combination facilitates the assembly and maintenance of the frequency converter, and greatly reduces the labor intensity and difficulty of on-site operators. At the same time, the utility model adopts the vertical arrangement of the fan and each component unit from top to bottom, so that the temperature rise inside the cabinet of the utility model can be controlled to avoid overheating of each unit, and play a better role in each component inside the cabinet. Protective effect, which can effectively prolong the service life of the inverter.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating preferred embodiments, and are not considered to limit the present invention. Also throughout the drawings, the same reference numerals are used to designate the same components. Wherein in the drawings, letter marks after reference numerals indicate a plurality of identical components, and when referring to these components generally, the last letter marks thereof will be omitted. In the attached picture:

Fig. 1 shows a schematic diagram of the internal structure of a frequency converter core of a modular unit of a preferred mode of the present invention;

Fig. 2 shows the internal structural schematic diagram 2 of the frequency converter core of a modular unit of a preferred mode of the present invention;

Fig. 3 shows the front perspective perspective view of the cabinet in the frequency converter core of a modular unit of a preferred mode of the present invention;

Fig. 4 shows a rear perspective perspective view of the cabinet in the frequency converter core of a modular unit of a preferred form of the present invention;

Figure 5 shows a perspective view of the fan assembly in Figure 1;

Fig. 6 shows a front perspective perspective view of the inverter unit in Fig. 1;

Fig. 7 shows a rear perspective perspective view of the inverter unit in Fig. 1;

Fig. 8 shows a top view of the inverter unit in Fig. 1;

Fig. 9 shows a front perspective perspective view of the rectification unit in Fig. 1;

Fig. 10 shows a rear perspective view of the rectifying unit in Fig. 1;

Figure 11 shows a top view of the rectification unit in Figure 1; and,

Fig. 12 shows a schematic structural diagram of an integrated movement in the prior art.

Reference signs:

1-cabinet, 2-fan assembly,

3- inverter unit, 4- rectifier unit,

5-cabinet frame, 6-panel,

7-front panel, 8-rear panel,

9-left panel, 10-right panel,

11-top panel, 12-air intake window,

13-air outlet, 14-fan housing,

15-cooling fan, 16-inverter box,

17-inverter radiator, 18-IGBT module,

19-inverter capacitor array, 20-inverter voltage equalizing resistor array,

21-inverter box ventilation hole, 22-inverter copper bar,

23-rectifier box, 24-rectifier radiator,

25-rectifier diode module, 26-rectifier capacitor array,

27-rectifier voltage equalizing resistor array, 28-rectifier box ventilation holes,

29- rectifier copper bar, 30- lap copper bar,

31-air duct, 32-installation plate,

33-air vent, 34-first support beam,

35-the second support beam, 36-the third support beam,

37-the fourth support beam, 38-lifting bolts,

39 - filtering unit.

detailed description

The utility model provides many applicable creative concepts, which can be embodied in a large number of specific contexts. The specific examples described in the following embodiments of the present utility model are only used as illustrations of specific embodiments of the present utility model, and do not constitute limitations on the scope of the present utility model.

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, this embodiment provides a modular unit inverter core, the inverter core includes a cabinet 1, a fan assembly 2, an inverter unit 3 and a rectifier unit 4, the fan assembly 2, The inverter unit 3 and the rectifier unit 4 are arranged sequentially from top to bottom inside the cabinet 1 , and the inverter unit 3 and the rectifier unit 4 are electrically connected to form an electrical circuit.

The inverter unit 3 is a device that converts DC power into AC power, and the rectifier unit 4 is a device that converts AC power into DC power. Under the action of the inverter unit 3 and rectifier unit 4, it cooperates with other components of the frequency converter to change the output power. The voltage and frequency to meet the actual power supply voltage required by the external motor. Specifically, the DC bus bars of the inverter unit 3 and the rectifier unit 4 are connected by overlapping copper bars 30 to form an electrical circuit.

The method of dismantling the traditional integrated core and combining the separate inverter unit 3 and the separate rectifier unit 4 in this embodiment is convenient for the assembly and maintenance of the inverter core, and greatly reduces the labor intensity and difficulty of on-site operators . At the same time, this embodiment adopts the arrangement of the fan assembly 2, the inverter unit 3, and the rectifier unit 4 from top to bottom, so that the temperature inside the cabinet 1 is relatively uniform, and the overheating of each unit is avoided, so that each component in the cabinet 1 It plays a better protective role and prolongs the service life of the inverter core.

Specifically, as shown in FIG. 5 , the fan assembly 2 in this embodiment includes a fan housing 14 and a cooling fan 15 , and the cooling fan 15 is installed inside the fan housing 14 for discharging the hot air in the cabinet 1 .

As shown in Figure 6, Figure 7 and Figure 8, the inverter unit 3 in this embodiment includes an inverter box 16, an inverter radiator 17, an IGBT module 18, an inverter capacitor array 19, and an inverter voltage equalizing resistor array 20. The inverter radiator 17 and the inverter capacitor array 19 are fixedly arranged on both sides of the bottom of the inverter box 16. The bottom of the IGBT module 18 is coated with thermal conductive silicone grease and fixed on the upper surface of the inverter radiator 17. The IGBT The heat generated when the module 18 works is discharged through the inverter radiator 17. The inverter voltage equalizing resistor array 20 is fixedly arranged on the upper part of the inverter capacitor array 19. Connected, the front and rear sides of the inverter box 16 are provided with inverter box ventilation holes 21 for heat dissipation of the inverter unit 3 .

The DC power rectified by the rectifying unit 4 is converted into AC power with adjustable voltage and frequency through the IGBT module 18 of the inverter unit 3 .

As shown in Fig. 9, Fig. 10 and Fig. 11, the rectification unit 4 in this embodiment includes a rectification box body 23, a rectification radiator 24, a rectification diode module 25, a rectification capacitor array 26, a rectification voltage equalizing resistor array 27, rectification and heat dissipation The rectifier 24 and the rectifier capacitor array 26 are fixedly arranged on both sides of the bottom of the rectifier box 23, and the bottom of the rectifier diode module 25 is coated with heat-conducting silicon grease and then fixedly arranged on the upper surface of the rectifier radiator 24. The heat is discharged through the rectification radiator 24, the rectification voltage equalizing resistor array 27 is fixedly arranged on the upper part of the rectification capacitor array 26, the rectification capacitor array 26 and the rectification diode module 25 are electrically connected through the rectification copper bar 29, the front and rear sides of the rectification box 23 Both are provided with rectification box ventilation holes 28 for heat dissipation of the rectification unit 4 .

After the three-phase power frequency AC input power is rectified by the rectifier diode module 25 to form a direct current, the direct current is added to both ends of the filter circuit formed by the rectifier capacitor array 26 and the inverter capacitor array 19. Under the action of the above filter circuit, the original pulsation The DC waveform will become smoother. Since the withstand voltage of a single capacitor is not enough, the rectifier capacitor array 26 and the inverter capacitor 19 adopt the method of capacitor series voltage division. piezoresistor array 27 and inverter equalizing resistor array 20.

In this embodiment, a rectifying capacitor array 26, an inverter capacitor array 19, a rectifying voltage equalizing resistor array 27 and an inverter voltage equalizing resistor array 20 are used to form a filter circuit, which replaces the filtering unit in the traditional frequency converter core, so that in this embodiment The inverter mechanism is more compact and the installation is more convenient.

As shown in Fig. 3 and Fig. 4, the cabinet 1 in the present embodiment is a bottom open square body, comprising a front panel 7, a rear panel 8, a left panel 9, a right panel 10, a top panel 11 and a cabinet frame 5, the front panel 7. The rear panel 8, left panel 9, right panel 10 and top panel 11 are arranged around the sides of the cabinet frame 5. The front panel 7 is openable and the bottom of the front panel 7 is provided with an air inlet window 12. The rear panel 8 There are air outlet holes 13 at the top.

The air outlet hole 13 of the rear panel 8 is set corresponding to the fan, and the external cold air enters through the air inlet window 12 at the bottom of the front panel 7 to cool the components and units in the cabinet 1, and finally passes through the opening at the top of the rear panel 8. Air outlet 13 outputs. The front panel 7 can be opened or closed, which is convenient for the staff to assemble and overhaul the components and units inside the cabinet 1 .

It is worth mentioning that, please continue to refer to Figure 1 and Figure 2, there is a mounting plate 32 inside the cabinet 1 for supporting the fan assembly 2, an air vent 33 is opened on the mounting plate 32, and an air duct 31 is also provided inside the cabinet 1 , the air duct 31 is arranged behind the inverter unit 3 and the rectifying unit 4 , the top of the air duct 31 is connected to the mounting plate 32 , and the air duct 31 is set correspondingly to the air vent 33 .

The heat flow from the inverter unit 3 and the rectifier unit 4 is collected by the air duct 31 , and the heat flow is discharged along the air duct 31 from the ventilation hole to the fan layer, and finally discharged from the cabinet 1 under the action of the fan.

This setting method ensures the heat dissipation of the inverter unit 3 and the rectifier unit 4, makes the overall temperature rise inside the cabinet 1 lower, and the heat distribution is more uniform, thereby preventing the units inside the cabinet 1 from being damaged due to long-term high-temperature environments. to damage.

In order to make all units and components inside the cabinet 1 installed stably, a support assembly is also provided inside the cabinet 1 of this embodiment, and the support assembly includes a first support beam 34, a second support beam 35, a third support beam 36 and The fourth support beam 37, a plurality of first support beams 34 are arranged on the bottom of the mounting plate 32 and are fixedly connected with the cabinet frame 5 for supporting the mounting plate 32, and a plurality of second support beams 35 are arranged on the bottom of the cabinet frame 5 The left and right sides are fixedly connected to the cabinet frame 5, a plurality of third support beams 36 are connected to the left and right corresponding second support beams 35, and a plurality of fourth support beams 37 are connected to the front and rear corresponding third support beams 36, and the inverter unit 3 and the rectifying unit 4 are fixedly connected with the third support beam 36 and the fourth support beam 37.

Specifically, the cabinet frame 5 in this embodiment includes four vertical support shafts forming a square body frame. Two first support beams 34 are arranged symmetrically at the bottom of the mounting plate 32 , respectively connected to two adjacent vertical support shafts and arranged perpendicular to the vertical support shafts, for stabilizing the mounting plate 32 and the fan assembly 2 . A plurality of second support beams 35 are arranged symmetrically on the left and right sides of the cabinet frame 5 and are perpendicular to the support shafts. Each second support beam 35 is connected to two adjacent vertical support shafts. Further, each third support beam The beam 36 is connected to the left and right corresponding second support beams 35 and is vertically arranged with the second support beam 35, and each fourth support beam 37 is connected with the front and rear corresponding third support beams 36 and is arranged vertically with the fourth support beam 37 , the inverter unit 3 and the rectification unit 4 are fixedly connected to the third support beam 36 and the fourth support beam 37 . The superposition of multiple support beams makes each component and each unit inside the cabinet 1 more stable, and ensures the long-term stable operation of the frequency converter core. Moreover, each unit or component can also be disassembled from the supporting component, which facilitates its assembly, maintenance and replacement, and has high practicability.

It should be noted that, please continue to refer to FIG. 3 and FIG. 4 , the top of the cabinet 1 in this embodiment is provided with a plurality of lifting bolts 38 . The lifting bolts 38 are used to connect external ropes for transportation, making the lifting and transportation more stable and safe.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim.

Claims (7)

1. the frequency converter movement of a kind of modular unit, it is characterised in that including rack (1), fan assembly (2), inversion unit (3) and rectification unit (4), the fan assembly (2), inversion unit (3) and rectification unit (4) the rack (1) it is internal from Top to bottm is arranged in order setting, and the inversion unit (3) and the rectification unit (4) are electrically connected to form electric loop.

2. the frequency converter movement of modular unit according to claim 1, it is characterised in that inversion unit (3) bag Include inversion casing (16), inversion radiator (17), IGBT module (18), inversion array of capacitors (19), inversion equalizing resistance battle array Arrange (20), the inversion radiator (17) and the inversion array of capacitors (19) are fixedly installed in the inversion casing (16) Two bottom sides, the IGBT module (18) is fixedly installed on the upper surface of the inversion radiator (17), and the inversion is pressed Electric resistance array (20) is fixedly installed on the top of the inversion array of capacitors (19), the IGBT module (18) and the inversion Array of capacitors (19) realizes electrical connection by inversion copper bar (22),

The front and rear sides of the inversion casing (16) offer inversion air vent of cabinet (21).

3. the frequency converter movement of modular unit according to claim 1, it is characterised in that rectification unit (4) bag Include rectification casing (23), rectification radiator (24), commutation diode module (25), commutation condenser array (26), rectification are pressed Electric resistance array (27), the rectification radiator (24) and the commutation condenser array (26) are fixedly installed on the rectification casing (23) two bottom sides in, the commutation diode module (25) are fixedly installed on the upper surface of the rectification radiator (24), The rectification equalizing resistance array (27) is fixedly installed on the top of the commutation condenser array (26), the commutation condenser Array (26) and the commutation diode module (25) are realized by rectification copper bar (29) to be electrically connected,

The front and rear sides of the rectification casing (23) offer rectification air vent of cabinet (28).

4. the frequency converter movement of modular unit according to claim 1, it is characterised in that the rack (1) is opened under being Mouthful formula, the rack (1) include panel (6) and cabinet framework (5), the panel (6) including front panel (7), rear board (8), Left panel (9), right panel (10), top panel (11) and cabinet framework (5), the front panel (7), rear board (8), left panel (9), right panel (10) and top panel (11) are looped around each side setting of the cabinet framework (5), and the front panel (7) is to open The bottom of formula and the front panel (7) is provided with air-inlet window (12), and exhaust vent (13) is offered at the top of the rear board (8).

5. the frequency converter movement of modular unit according to claim 1, it is characterised in that set inside the rack (1) Installing plate (32) is equipped with, for supporting fan assembly (2), ventilating opening (33) is offered on the installing plate (32),

It is additionally provided with air channel (31) inside the rack (1), the air channel (31) is arranged on the inversion unit (3) and described whole The rear of unit (4) is flowed, the top of the air channel (31) is connected with installing plate (32), and the air channel (31) and the ventilating opening (33) it is correspondingly arranged.

6. the frequency converter movement of modular unit according to claim 5, it is characterised in that set inside the rack (1) It is equipped with support component, the support component includes the first support beam (34), the second support beam (35), the 3rd support beam (36) and the Four support beams (37), more first support beams (34) be arranged on the bottom of the installing plate (32) and with the cabinet framework (5) it is fixedly connected, for being supported to the installing plate (32), more second support beams (35) are arranged on the rack The left and right sides of framework (5) is simultaneously fixedly connected with the cabinet framework (5), and more 3rd support beam (36) the connection left and right are right Second support beam (35) answered is set, the 3rd support beam of more 4th support beam (37) the connection correspondences (36) set, the inversion unit (3) and the rectification unit (4) and the 3rd support beam (36) and the 4th support beam (37) It is fixedly linked.

7. the frequency converter movement of the modular unit according to any one in claim 1~6, it is characterised in that described Multiple lifting bolts (38) are provided with the top of rack (1).